BT soundmixerl class

I have been searching for the method for controlling the global sound in as. I saw on the Internet that someone said it was the soundmixer class, but I tried the following method and it turned out to be invalid.

1 If (value)
2 soundmixer. soundtransform. volume = 1;
3 else
4 soundmixer. soundtransform. volume = 0;
5
6

I checked a lot of information and found that the soundtransform class is not so useful. To change the soundtransform attributes of soundmixer and soundchanel, you must use the following method:

VaR soundtransform: soundtransform = new soundtransform ();
If (value)
Soundtransform. volume = 1;
Else
Soundtransform. volume = 0;
Soundmixer. soundtransform = soundtransform;